ALL TOOLS
294 curated software tools across 21 categories. No marketing hype. Just the facts.
Mail-in-a-Box
OPEN SRCTurns any Ubuntu server into a fully functional mail server with one command
Mailcow
OPEN SRCMail server suite based on Dovecot, Postfix and other open source software, that provides a modern Web UI for administration
Mailu
OPEN SRCSimple yet full-featured mail server as a set of Docker images
Modoboa
OPEN SRCMail hosting and management platform including a modern and simplified web user interface
Mox
OPEN SRCComplete e-mail solution with IMAP4, SMTP, SPF, DKIM, DMARC, MTA-STS, DANE and DNSSEC, reputation-based and content-based junk filtering, Internationalization (IDNA), automatic TLS with ACME and Let's Encrypt, account autoconfiguration, and webmail
SimpleLogin
OPEN SRCOpen source email alias solution to protect your email address. Comes with browser extensions and mobile apps
Stalwart Mail Server
OPEN SRCAll-in-one mail server with JMAP, IMAP4, and SMTP support and a wide range of modern features
wildduck
OPEN SRCScalable open-source mail server with no single point of failure
Cyrus IMAP
OPEN SRCThe complete, scalable, and open-source email, contacts, and calendar server.
Gotify
OPEN SRCNotification server with Android and CLI clients (alternative to PushBullet)
Hyphanet
OPEN SRCAnonymously share files, browse and publish _freesites_ (web sites accessible only through Hyphanet) and chat on forums
Jami
OPEN SRCUniversal communication platform which preserves the user's privacy and freedoms.
Live Helper Chat
OPEN SRCLive chat software to engage visitors and convert them into customers
Mumble
OPEN SRCLow-latency, high quality voice/text chat software.
ntfy
OPEN SRCPush notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify.
One Time Secret
OPEN SRCShare sensitive information securely with self-destructing links that are only viewable once
OTS
OPEN SRCOne-Time-Secret sharing platform with a symmetric 256bit AES encryption in the browser
RetroShare
OPEN SRCSecured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.
Rocket.Chat
OPEN SRCCommunications platform that puts data protection first (alternative to Gitter.im and Slack).
Screego
OPEN SRCScreego is a simple tool to quickly share your screen to one or multiple people via web browser
Spectrum 2
OPEN SRCSpectrum 2 is an open source instant messaging transport. It allows users to chat together even when they are using different IM networks.
Stoat
OPEN SRCStoat is a user-first chat platform built with modern web technologies.
Synapse
OPEN SRCServer for [Matrix](https://matrix.org/), an open standard for decentralized persistent communication
Tailchat
OPEN SRCNext generation noIM application in your own workspace, not only another Slack/Discord/rocket.chat.
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HOW WE REVIEW SOFTWARE
Every tool in the VentureGaps directory is evaluated through comprehensive research, verified user feedback, and data-driven analysis. We assess pricing transparency, feature depth, user satisfaction, and integration capabilities. Our ratings reflect real-world usage patterns and publicly available data — not paid placements. The directory is continuously updated to reflect the latest changes in pricing, features, and market positioning.
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